A bullet travelling at is brought to rest in when it enters a wooden block

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

10\,\text{g}

bullet travelling at

400\,\text{m s}^{-1}

is brought to rest in

0.003\,\text{s}

when it enters a wooden block. An identical bullet with the same initial speed is brought to rest in

0.006\,\text{s}

when it enters sand. What is the ratio of the magnitudes of the average retarding forces exerted by the wood and the sand respectively? (a)

1 : 2

(b)

4 : 1

(c)

2 : 1

(d)

1 : 1